I was told when using the EO/IC method of lashing valves on my solid roller cam, that the cam actually deflects around .005 from the spring pressure, so that method may not be the best. ENGINE BUILDERS, CAM DESIGNERS...OPINIONS??? :D

THANKS, NICK

Originally posted by 70SS540:
I was told when using the EO/IC method of lashing valves on my solid roller cam, that the cam actually deflects around .005 from the spring pressure, so that method may not be the best. ENGINE BUILDERS, CAM DESIGNERS...OPINIONS??? :D

THANKS, NICK =
Not really true. They do deflect as does everything in the engine but you are going to have spring pressure pushing on the cam no matter how you adjust it.
Both from adjacent cylinders as well as cylinders from the opposite side of the engine depending on which cylinder you are adjusting.
Plus you have one lobe right next to a bearing & one further away so they would deflect a different amount even if you could somehow account for it in your adjustment procedure ;)

I assume you mean torsional deflection. Well, this is something that all MEs must play with during school. I can tell you that by judging by the sheer modulus of elasticity, moment of inertia, torque, and the overall legnth, .005" would be pretty excessive.

Woops read the post wrong. I still cant imagine it moving .005"! Maybe thats just on John Forces 8,000hp engine?

I know most cam companies now check their cams with them hanging from one end because they found that laying them in a pair of "V" blocks caused a measureable dip in the middle. But I think this is because the tool is so sensitive. The average person would never see it.
Plus with 4 bearings you would have to see that .005" deflection between 2 of them and with that much spring pressure, the motor wouldn't turn over!

Jeff